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21. [Amps] Building an amp (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 30 Jan 2010 07:24:03 -0800
carl is right simple 813's.. and 4-400's in GG will work just fine. One can always 'up- grade' to Chinese 3-500Z later on... [ or a 3CX-1200] That socket will handle 4-400A/B/C 3-400Z and 3-500Z 3CX-
/archives//html/Amps/2010-01/msg00507.html (7,600 bytes)

22. [Amps] Good amp to buy /amp notes (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Fri, 29 Jan 2010 20:36:19 -0800
Date: Fri, 29 Jan 2010 14:41:13 -0500 From: "Carl" <km1h@jeremy.mv.com> Subject: Re: [Amps] Good amp to buy To: "Bill K2OWR" <k2owr@comcast.net>, "Lee Buller" <k0wa@swbell.net> Cc: amps@contesting.co
/archives//html/Amps/2010-01/msg00596.html (14,487 bytes)

23. [Amps] Fw: Good amp to buy /amp notes (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 30 Jan 2010 01:00:55 -0800
You may be surprised to know that the AL-82 uses the same capacitor vendor with the same plate spacings as the SB-220. It uses the same bandswitch construction as several Dentrons. Generic Modutec me
/archives//html/Amps/2010-01/msg00597.html (14,986 bytes)

24. [Amps] HB amps (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 31 Jan 2010 22:19:35 -0800
<<<<<You can't really compare hamfest scrounged parts to brand new. Would you buy an amp from Alpha if they told you all the parts were scrounged from a hamfest? When a person finishes their scrounge
/archives//html/Amps/2010-01/msg00644.html (10,505 bytes)

25. [Amps] Plate choke resonances / spark gap fix. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 1 Feb 2010 23:28:03 -0800
My point is that you are worried about parallel resonance in the plate choke and damage to it because of that. I am pointing out that the voltage across the choke will be held in check by the tank c
/archives//html/Amps/2010-02/msg00069.html (10,859 bytes)

26. [Amps] Fw: ALC/peak limiting/ etc. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 1 Feb 2010 23:30:11 -0800
From: Rob Atkinson <ranchorobbo@gmail.com> Subject: Re: [Amps] Good amp to buy (or something like that) To: garyschafer@comcast.net Cc: amps@contesting.com Message-ID: <d2bb1cb81001311117k21a87e4ema5
/archives//html/Amps/2010-02/msg00070.html (10,633 bytes)

27. [Amps] Fleamarkets (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 2 Feb 2010 01:28:22 -0800
What did surprise me was that when I bought a couple of large vacuum variable capacitors on the fleamarket at Dayton and was carrying them around and back to the car, I lost count of the number of gu
/archives//html/Amps/2010-02/msg00072.html (8,094 bytes)

28. [Amps] Fleamarkets (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 2 Feb 2010 18:03:57 -0800
I live in Cowtown usa 3500 people 15,000 cows you can smell them on a warm summer night but it's a good smell unless you are from the city - but unlike some areas we still have sufficient water (and
/archives//html/Amps/2010-02/msg00102.html (8,421 bytes)

29. [Amps] HV relay (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 6 Feb 2010 01:17:59 -0800
Well Jim, Im changing my 2@3-500Z amp to a single GS-35B and in the spec's for the tube it states that the warm-up time is Aprox~ 2 minute. So instead of using a power SCR in the mains to switch on t
/archives//html/Amps/2010-02/msg00141.html (8,811 bytes)

30. [Amps] QRO questions. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 6 Feb 2010 01:34:14 -0800
I've never run anything stronger than a SB-220 or a 30S-1, and I was wondering after seeing some of the European QRO+++ stations ....... what do they use for a rotor loop ? Seems that RG-8 and PL-259
/archives//html/Amps/2010-02/msg00142.html (7,887 bytes)

31. [Amps] QRO-RG-142 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 03:45:43 -0800
That RG-142 is great stuff. As test engineer at Harris I often had ten, 10 kW TX's on burn-in at the same time with the dummy loads near the TX. 20+ kW of heat generated by each was waaaay to much fo
/archives//html/Amps/2010-02/msg00175.html (7,503 bytes)

32. [Amps] Vac relay's for B+ (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 04:21:24 -0800
I'm changing my 2@3-500Z amp to a single GS-35B and in the spec's for the tube it states that the warm-up time is Aprox~ 2 minute. So instead of using a power SCR in the mains to switch on the HV ban
/archives//html/Amps/2010-02/msg00176.html (10,748 bytes)

33. [Amps] QRO questions (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 06:35:39 -0800
Hi Ron Times Microwave also makes a similar coax to RG142 called FBT-600. This coax was designed for high power jumpering. FBT-600 coax is flame retarding in nature,,, designed for running in ceiling
/archives//html/Amps/2010-02/msg00180.html (9,517 bytes)

34. [Amps] QRO questions (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 06:46:38 -0800
Typically we'd blow out about one of those every day of two. The transports that moved through vacuum seals also used Teflon insulation. There was always a bunch of those stacked up waiting to be reb
/archives//html/Amps/2010-02/msg00182.html (7,360 bytes)

35. [Amps] Converting a 76A to a pair of 3CX800's (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 16:08:27 -0800
Buy the 470V rated caps (thats whats claimed and marked on them) from Ameritron to give you some headroom. You could also drop the input AC with a fat bucking transformer as long as the filaments sta
/archives//html/Amps/2010-02/msg00212.html (8,711 bytes)

36. [Amps] Tentec Titan 425 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 17:40:30 -0800
These amps drive to full power with about 50 watts. Do NOT depend on ALC to set the power. Instead, back off on the drive power using the output power setting on your transceiver to get the desired p
/archives//html/Amps/2010-02/msg00215.html (8,919 bytes)

37. [Amps] resistor b4 the HV filter-part 2 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 22:38:52 -0800
. Here is the counterargument. First, there are two benefits of the resistor; it microswitch + relay. Variac brings the B+ up to max, and then is effectively switched out of the circuit.[2nd cam and
/archives//html/Amps/2010-02/msg00222.html (8,862 bytes)

38. [Amps] Resistor between FWB / FWD and B+ filter cap[S] part-1 (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sun, 7 Feb 2010 23:02:24 -0800
I have seen a few older commercial amps with a resistor on the transformer side of the filter capacitors. I have also seen it in older handbook power supply projects. and FWB/ FWD is fubar, doesn't w
/archives//html/Amps/2010-02/msg00223.html (11,580 bytes)

39. [Amps] step start /triacs (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 8 Feb 2010 04:04:43 -0800
Yep. Emtron have been doing it for many years and it is superb. Alek, VK6APK 1x sec, or what I suspect is from a zero cross point, up to the top of the cycle.. [IE: 4.17 msecs] ???? They should also
/archives//html/Amps/2010-02/msg00228.html (7,569 bytes)

40. [Amps] resistor between FWB/FWB and HV caps. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 9 Feb 2010 04:37:46 -0800
Maybe the other Jim VE7RF can give us some actual numbers on the peak current from his calculator. I am too lazy to figure it out at the moment. 73 Gary K4FMX machine. work. dc resistance, plus input
/archives//html/Amps/2010-02/msg00276.html (11,929 bytes)

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